Patent GB-190102519-A (GB)
Title: Improvements in Typewriters.
Inventor: DAVID JEAN FRANCOIS
Filed: 1901-02-05
Granted: 1901-07-13
Abstract: 2519. David, J. F. Feb. 5. Type - writers.-Fig. 1 shows the machine in sectional elevation, and Fig. 6 in transverse section at A-B. The keyboard and type-bars are carried by a frame pivoted at i and consisting of two plates d, e integral with a front plate j. The typebars f are directed radially towards the impressionpoint, and each bears six types on its face. Guides k ensure the accurate striking of the type on the platen c. The keys g<1> are carried by tubular posts g provided with slots through which the type-bars pass. Within the posts g are mounted small pulleys l, underneath which pass wires m secured at one end to the plate d and at the other to the forward ends of the type-bars. The depression of a key shortens the wire and draws the type-bar towards the platen against the tension of a controlling-spring o. A small cylinder p, tensioned downwards by suitable springs, rests on the rear ends of the type-bars, to prevent them from rising. The third and fifth characters on the type-bar are brought to the printing position by depressing the shift-keys 1 and 2 respectively. The shiftkeys act on a lever frame 4 pivoted at 5, so as to elevate its rear end and lift the frame d, e. The intermediate characters, i.e., the second, fourth, and sixth, are obtained by depressing also a key 10, which causes a pivoted frame k<1> to rise to an amount limited by stops 12. The frame k<1> supports the guides k, which are connected by a plate 8 over which the type-bar has to travel before reaching the impression point. The paper-carriage consists of a frame guided on a tongue or rib 15 and resting at the rear against an adjustable guide-bar 18. Two or more adjustable spring plates 13 guide the paper round the platen c. The carriage feed ia effected by means of a strap 22 secured at each end to the carriage and passing round a pulley 23, which is integral with two other pulleys 25, 26. Over the pulley 25 passes a brake strap 27, attached at 28 to the base of the machine, and at the other end to a spring 29. A universal bar 31, Fig. 1, is depressed whenever a key is operated, thus lifting the rear arm 33 of a frame 31<a>, pivoted at 35, Against the tension of a spring 36. The arm 33 is connected to a metal strap 38 passing over the pulley 26 and connected at the other end to a spring 39. When the arm 33 rises, the strap 27 prevents movement of the pulleys, but, on the release of the key, the spring 36 depresses the arm and the pulleys are turned, the carriage being fed one space forward. Flexible wires passing several times round the pulleys may replace the metal straps, A differential feed is effected by means of adjustable screws 40, 41, 42 on the posts g. The shift-keys 1, 2 have rods 47 which act indirectly on the bar 31 through the medium of a lever 43. Underneath the arm 33 is adapted to slide a wedge-shaped stop 48 adjustable in position by means of a cord 50 passing to a button at the front of the machine. A general widening or narrowing of the letter-spaces can thus be obtained. Line-spacing is effected by a metal strap 56, Figs. 4 and 6, which passes over the platen c and is connected at one end to a spring 58 and at the other to a vertically-sliding block 57 bearing the line-spacing key 59. To the block 57 may be attached a cord 62 passing over pulleys 63, 64 to the right-hand side of the machine, where it is connected to a sliding block. This block is drawn forward by the operator to shift the carriage for the commencement of a new line, and, the cord being attached to the block 57, the platen is turned through a line-space at the same time. The inking of the type is effected by a roller 67, which rises to allow the type-bar to advance, as indicated by the dotted lines in Fig. 1. The inking- roller frame is movable longitudinally on its supporting-bar 68 to bring a fresh part of the roller, which may be of the multi-colour type, into action. The portions of various colours may be separated by washers of caoutchouc &c. This system of inking may be applied to the Y÷st, Williams, and other machines.